Flue-stopper for fireproof doors and shutters



F. L. SAINO.

FLUE STOPP ER FOR FIREPROOF DOORS AND SHUTTERS.

' APPLICATION FILED MAY 27. 1915.

1 1 95,097 Patented Aug. 15, 1916.

FELIX L. SAINO, OF MEMPHIS, TENNESSEE.

FLUE-STOPPER FOR FIREPROOF DOORS AND SHUTTERS.

Specification of Letters Patent.

Patented Aug. 15, 1916.

Application filed May 27, 1915. Serial No. 30,833.

To all whom it may concern.-

Be it known that I, FELIX L. SAINO, a citizen of the United States, residing at Memphis, Shelby county, and State of Tennessee, have invented and discovered certain new and useful Improvements in Flue-Stoppers for Fireproof Doors and Shutters, of which the following is a specification.

The present invention relates to fire-proof doors and shutters and consists in the combinations and arrangements of elements hereinafter described and particularly set forth in the accompanying claims.

WVith fire-proof doors and shutters constructed of adjacent sheet metal walls, there is the disadvantage that said walls form a flue between them, and, when subjected to the heat incident to the burning of a building, said walls separate and further increase the flue draft with disastrous results. And it is, therefore, the purpose of this invention to produce a door or shutter of the type in question embodying means that will prevent the formation of these flues.

The invention is shown by way of illustration in the accompanying drawing, wherein Figure 1 is a fragmentary central sectional view of a door or shutter illustrating the application of the invention, Fig. 2 is a similar view illustrating -a modified form of the flue stopper, and Fig. 3 a detail perspective view of the flue stopper shown in Fig. 2.

Referring to the construction in detail, and wherein like reference characters indicate corresponding parts in the different views, 1 and 3 designate respectively the front and rear walls of a fire-proof door or shutter that are constructed preferably of corrugated sheet metal, and 2 is an intermediate sheet of refractory substance, such as asbestos or the like. Said walls and the asbestos sheet of the shutter or door comprise a single unit that is contained within and reinforced by a suitable frame, as fully set forth in my co-pending application for United States Patent, bearing the Serial Number 32,948 and dated June 8, 1915.

The walls 1 and 3 are secured together by suitable fastenings which include fusible elements that operate to release such fastenings and permit said walls, or the shutter as a unit, to expand and eifectively close the door or window opening, as clearly set forth in my application above identified.

The wall 1 has the corrugations thereof arranged vertically and this, with the adjacent wall 2, forms a series of openings 3 running lengthwise of the door. These openings produce a flue, and when the fastening devices are released, the walls 1 and 3 will tend to separate and greatly increase the flue effect, with the result that a con siderable draft will be created conducive to the spreading or intensity of the flame, and, to avoid this condition, it is proposed to provide a draft stopper along the upper and lower edges of the door or shutter. The said stopper consists of a strip 4 formed from the wall 3 by suitably bending the same at 5 and folding it upon itself as at 6.

In the arrangement shown in Figs. 2 and 3, the draft stopper is in all respects similar to that above described, excepting that the same is formed as a separate piece adapted to be readily attached to the door or shutter by suitable fastenings. In the instant arrangement the strip 4 is formed with a flange or tongue 7 that enters within the groove or channel 8 constructed by bending the lower edge of the sheet 3 at 9 and then folding such bended portion upon itself.

It will be evident from the foregoing that, while the walls 1 and 3 may be allowed to separate, all tendency to produce a fiue therebetween is destroyed, and that the draft stoppers will provide suitable abutments for bearing against the window or door frame when the door or shutterhas expanded.

It is obvious that those skilled in the art may vary the details of construction and arrangement of parts without departing from the spirit of the invention, and therefore I do not wish to be limited to such features except as may be required by the claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination of a fire-proof door or shutter comprising adjacent sheet metal walls arranged to form a flue between them, of a draft stopper consisting of an angle plate secured by one flange to the face of the door near each end and with its other flange extending each way from said face,

in one direction to cover the space between the two walls of the door and in the other direction to cover the space between the door and the adjacent wall of the building, substantially as set forth.

2. The combination with a fire-proof door or shutter comprising adjacent sheet metal walls adapted to form a flue between them when separated, the lower edge of one of said walls being bent laterally to one side thereof and said bent portion folded upon itself and disposed transversely to the opposite side of the wall and closely overlying the space between said walls, said laterally disposed plate providing a draft stopper for the flue formed between said walls when the same are separated, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Memphis, Tennessee, this 19th day of May, A. D. nineteen hundred and fifteen.

FELIX L. SAINO. [1,. s]

Witnesses JOHN L. Sroor, J OI'IN FARLEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

